. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. COXTFERALES 63 plasm and not pitted. Tlie former cells are said to represent an extension of the traclieid system, passing water from the xylem to the mesophyll; and the latter to mediate between the mesophyll and the phloem in the transfer of organized material (Fig. 47). The single bundle which enters the leaf divides into two strands in the narrow leaves, and the strands run parallel and near together with a common bundle sheath. In broader leaves. i^'iG. 47.—riniis Lufii-lo^ cross seetion of a needle, x 7
. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. COXTFERALES 63 plasm and not pitted. Tlie former cells are said to represent an extension of the traclieid system, passing water from the xylem to the mesophyll; and the latter to mediate between the mesophyll and the phloem in the transfer of organized material (Fig. 47). The single bundle which enters the leaf divides into two strands in the narrow leaves, and the strands run parallel and near together with a common bundle sheath. In broader leaves. i^'iG. 47.—riniis Lufii-lo^ cross seetion of a needle, x 70. the bundle divides into several more divergent strands. In no case do the veins come near the surface, but run through the middle tissue. THE HOOT In strong contrast with the Pteridophytes, the primary root in Conifers persists as a tap root; while, according to De Bary ^'^, following Strasburger,^" the difi'erentiation of the meristem at the apex is different from that of Angiosperms, as was indicated in connection with the Cycads. The description given Ijy De Bary is essentially as follows, and the accompanying figure (Fig. 48) from tlie same source will fully illustrate it: " A plerome cylinder with sharp. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coulter, John Merle, 1851-1928; Chamberlain, Charles Joseph, b. 1863. New York, D. Appleton
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Keywords: ., bookauthorcoulterj, bookcentury1900, bookdecade1900, bookyear1901
